What does a revenue diversion issue refer to for airports?

A revenue diversion issue for airports specifically refers to the practice of utilizing airport funds for unrelated purposes. This situation arises when an airport's generated revenue, which is intended to be used solely for airport-related expenses, is instead allocated to projects or services that do not directly benefit the airport's operations or development.

Airports are typically funded through various revenue streams such as landing fees, terminal rents, and concessions. Regulatory frameworks, such as those from the Federal Aviation Administration in the U.S., emphasize that these funds should be reinvested into the airport's infrastructure, operational needs, and improvements. When funds are diverted to unrelated purposes, it undermines the financial integrity of the airport, potentially impacting its ability to maintain and develop necessary facilities. This can lead to reduced safety, efficiency, and overall service quality for airport users.

The other options, while they represent important airport financial considerations, do not align with the definition of revenue diversion. For instance, using revenue for airport maintenance is a proper use of funds, as is redirecting funds for expansion projects or investing in security upgrades, provided that these are within the scope of airport operations and objectives.